Precious stone



FIG. 1 is a top plan view of a precious stone showing my new design;

FIG. 2 is a side elevational view, the opposite side view being a mirror image;

FIG. 3 is a bottom plan view;

FIG. 4 is a top plan view of a precious stone showing a second embodiment of my new design;

FIG. 5 is a side elevational view of FIG. 4, the opposite side view being a mirror image; and,

FIG. 6 is a bottom plan view of FIG. 4. 

The ornamental design for a precious stone, as shown and described. 